i have good suggestion to this
1.if you buy pill,then no one can pk you(GM can setting this)
this can help player and sever(earn more money to run the sever forever...)
2.if pked is higher lvl than other 50+ lvl,cant pk this player(e.g.prevent 150 lvl to pk under 100 lvl/d1 to pk 1-55 lvl...etc)